16.A fully charged capacitor is allowed to discharge through an inductor of 0.5 mH. The initial current through the inductance rises from 0 to 1.5 A in 2.5�s. The instantaneous voltage across it is:

17.In an electromagnetic wave, the average energy density is associated to:

18.The nature of electric field in the region between the two plates of a capacitor, while charging, is:

19.Which one of the following can produce maximum induced emf?

20.An output voltage of E = 170 sin 377t is produced by an AC generator, where t is in sec, then the frequency of alternating voltage will be: